I did an upgrade without a wipe and the device is locked up with Telenav requesting permissions. Pulled the battery and I was able to remove Telenav with the desktop manager. BBSAK wouldn't connect to the device no matter what I did. Phone rebooted and it then hung up on the AT&T boot screen. I was forced to pull the battery and use Apploader to restore the OS. I RECOMMEND a FULL wipe before installing this build.